A method controls manipulation of a computing device. Disclosed are \u03b1 alumina for the production of a sapphire single crystal, including 100 parts by weight of \u03b1 alumina and 25 to 235 parts by weight of \u03b1 alumina, wherein the \u03b1 alumina has a specific surface area of 0. Reinforcement material is secured to the headlap portion and includes outwardly extending attachment members configured to penetrate and mechanically bond with the tab sealant of an overlapping roofing shingle when installed on a roof. A strain sensor can be utilized to generate clamping force readouts that are based on the amount of structural deflection of the arm detected by the sensor.